Biology 12 Glossary      Page  N - O    

Puzzle Page

Nail matrix

Natural selection

Negative-feedback mechanism

nematocyst

Nematoda

Nephridium

Nephron

Nervous system

Neuron  neurotransmitter

Neutralization reaction

Neutron

Niche

Nitrogen cycle   Nitrogen fixation

Nonspecific defense

Notochord

Nuclear envelope

Nucleic acid

Nucleolus

Nucleotide

Obligate anaerobe

Olfactory bulb

Oligochaete

Operant conditioning

Operon

Optic lobe

Organelle

Organic compounds

Osculum

Osmosis

Ossification

Osteocyte

Ovary

Ovulation

Ovule

Ovum

Oxygen cycle

P

F